48920078615521 has 3 divisors (see below), whose sum is σ = 48920085609811. Its totient is φ = 48920071621232.

The previous prime is 48920078615489. The next prime is 48920078615531. The reversal of 48920078615521 is 12551687002984.

The square root of 48920078615521 is 6994289.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 326910641121 + 48593167974400 = 571761^2 + 6970880^2 .

It is not a de Polignac number, because 48920078615521 - 2⁵ = 48920078615489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (48920078615531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3497145 + ... + 10491433.

Almost surely, 2^{48920078615521} is an apocalyptic number.

48920078615521 is the 6994289-th square number.

48920078615521 is the 3497145-th centered octagonal number.

It is an amenable number.

48920078615521 is a deficient number, since it is larger than the sum of its proper divisors (6994290).

48920078615521 is an frugal number, since it uses more digits than its factorization.

48920078615521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13988578 (or 6994289 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 58.

The spelling of 48920078615521 in words is "forty-eight trillion, nine hundred twenty billion, seventy-eight million, six hundred fifteen thousand, five hundred twenty-one".